Untitled notebook

Section

defmodule Solution do
  @spec rotated_digits(n :: integer) :: integer
  def rotated_digits(n) do
    rotated = %{
      "0" => "0",
      "1" => "1",
      "8" => "8"
    }

    1..n
    |> Enum.map(&(&1 |> to_string() |> String.split("", trim: true)))
    |> Enum.reject(fn x ->
      x
      |> Enum.any?(fn y ->
        y == "3" or y == "4" or y == "7"
      end)
    end)
    |> Enum.reject(fn x ->
      x
      |> Enum.all?(fn y ->
        rotated[y]
      end)
    end)
    |> length()
  end
end